Singing was originally invented in the 1400s and would NEVER acompany a tune. It was just words (thousands of years after musical instruments were played).
The combination of adding the sung words TO the played instruments was a more modern combination. A few weeks later, Top of the Pops was created as a by product of this event.
Also, “Now that’s what I call Music 1” was released at a similar time.
Makes you think.
DrP